The footpath through Ellastone & Calwich takes one past this stone structure standing at the end of a bridge. It might be historic, as it was probably on the estate of Calwich Abbey Hall (two hundred yards away), which has a long history anyway.
Was it a small gatehouse?
However, it seems to serve no purpose now.
What I like about that is that the estate's owners have just left it alone. Or maybe they couldn't be bothered to do anything other, than leave it alone....